A coupling beam, and method for constructing multi-story buildings. A first member has holes through which the liquid passes to be nebulized. Each of the head sections includes a plurality of bristles extending from the bottom surface of that head section and at least one of the head sections includes a plurality of elastomeric fingers partially defining the side surface of that head section and partially extending from the bottom surface of that head section. If there is no common center stage among the three ports, then rearrangement candidates are identified to free up an available center stage.